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Friedl (wrist) and team decision-makers were scheduled for a call Sunday evening to discuss the outfielder's potential return, Mark Sheldon of MLB.com reports.

Advice: Friedl, who made a fourth consecutive appearance Sunday on a rehab assignment at Triple-A Louisville, could be activated as soon as Tuesday, when the Reds open a three-game series at home against the Diamondbacks. "There is a chance," manager David Bell said. "I think we are all going to be involved in that decision." Friedl fractured his right wrist while diving for a ball March 16 and opened the season on the injured list. He's 4-for-16 with three doubles while on rehab with the Bats. Rotowire.com 15 minutes ago

Thomas (hamstring) served as the designated hitter and went 1-for-4 with a double, two RBI and a run scored for Triple-A Reno on Sunday.

Advice: Thomas, who played in the field Saturday and DH on Friday, has appeared in the three consecutive games. He hit safely in all three and driven in five runs. If there are no setbacks, he's expected to meet up with the Diamondbacks in Cincinnati for a three-game series beginning Tuesday, according to Alex Weiner of Arizona Sports. The Reds have right-hander Frankie Montas scheduled to throw Tuesday, so the lefty-hitting Thomas could be in the lineup for the series opener. Rotowire.com 52 minutes ago

Waldron (1-4) took the loss Sunday against the Diamondbacks, allowing eight runs (seven earned) on eight hits and three walks while striking out two over three innings.

Advice: Waldron suffered his worst outing of the season, allowing a career-high eight runs while also posting the shortest outing since he debuted last year. The Diamondbacks put up a four-spot on him in the first, highlighted by a two-run blast from Ketel Marte. They tacked on another two in the second and then chased him out of the fourth with back-to-back doubles to open up in the inning. Despite the shaky results, Waldron may have been given another life after Joe Musgrove was put on the 15-day IL Sunday with elbow inflammation. He now owns a 5.82 ERA, 1.56 WHIP and 29:13 K:BB in 34 innings and is expected to take the mound against versus the Dodgers over the weekend. Rotowire.com Today, 4:40 am

Boyle, who was lifted after one inning in Sunday's loss to the Marlins, was suffering from lower-back pain that got worse the more he threw during the frame, MLB.com reports.

Advice: Boyle's performance clearly seemed to be affected by his physical limitations, as he allowed four earned runs on a hit and three walks over his sole inning on the mound. Manager Mark Kotsay confirmed Boyle would undergo an MRI on Monday to determine the severity of the injury, at which point the right-hander's chances of making his next scheduled start Saturday against the Mariners will become clearer. Per Sonja Chen of MLB.com, right-handers Osvaldo Bido and Joey Estes, both of whom have big-league experience and are on the 40-man roster, are candidates to be called up from Triple-A Las Vegas should Boyle miss at least one turn through the rotation, although she adds Oakland has long relievers Mitch Spence and Kyle Muller as options on the big-league roster. Rotowire.com Yesterday, 11:01 pm